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dd is a common program for Unix and Unix-like operating systems whose primary purpose is to “convert and copy a file.” It can duplicate data accross files, devices and partitions and volumes.

Usage:

dd if=source of=target bs=byte_size
("USUALLY" some power of 2, and usually not less than 512 bytes (ie, 512, 1024, 2048, 4096, 8192, 16384, but can be any reasonable whole integer value.) skip= seek= conv=

Examples:
1. Duplicate one hard disk partition to another hard disk partition: You want to duplicate sda2 to sdb2.